on chat:
	if {prefix.%player%} is not set:
		set {prefix.%player%} to ""
	cancel event
	broadcast "%{prefix.%player%}%%player% &7>> &f%message%"

command /prefix [<text>]:
	trigger:
		if arg is not set:
			set {prefix.%player%} to ""
			stop
		set {prefix.%player%} to arg
		send "prefixを %arg%に変更しました"